[SIPForum-discussion] enforcing a variable policy on codec choice

[Andrew Yu]

Hi William,

Codec selection depends on the endpoint where it is internally 
configured with its codec priority, if you require the endpoint to 
select 711 internally but 729 over the WAN, this is a feature that the 
endpoint will have to support. SIP & SDP RFCs does not enforce any 
policy on the choice of media codec. I hope this helps. Thanks.

Andrew

William Flanagan wrote:
> Hi,
>
> In reading the SIP and SDP RFCs, I see no obvious mechanism to enforce 
> a policy on the choice of voice codec (for compression ratio or 
> bandwidth usage) that would vary by called party.  For example, one 
> might prefer G.711 locally, but require G.729 over the WAN.  Does any 
> one know of such a deployment?
>
> Thanks,
> Bill
>
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